When an item in an item frame is rotated 7 times it will be gone after reloading the world. To reproduce the problem you can rotate an item to be the same as the middle item frame in screenshot 1, and reload the world.
MC-59021
Item Frames with rotated items Disappear After Reloading the World
Resolved
Fixed
0
Cannot confirm in 14w26c
Saving was broken in 14w26b